spanner is a tool used to provide grip on hexagonal or square tops to nuts and bolts to tighten them or to use to hold one top in place whilst turning another i.e. when tightening or slackening a nut and bolt
engineers, technicians and virtually everybody in the field of engineering uses spanners.
It is used to remove bolts.
Hammers, spanners, screwdrivers, chisels & spanners....
Spanners - 2013 was released on: USA: 2013
Spanners - album - was created on 1995-04-25.
for workshop use
They are a range of spanners (wrenches) used mainly in the British aircraft industry in the 1930's to the 1960's.
Spanners are used for all kinds of home related works. They are also a crucial part of almost all workshops, including auto shops. Most people have spanners at home and use them in the kitchen or the bathroom.
I'm not sure what there is to "explain" about them; they're spanners ("wrenches") that are made of an alloy containing chromium.
drop forging
Width of gaps
Scaffold spanners can be found online at various auction sites. Also, they can be found at scaffold specialty stores that are also easily accessible online.